Subject: RE: [xsl] XPath for matching multiple child elements|
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Fri, 29 Sep 2006 09:46:00 -0400
> But it's free enough to support a bit of a workaround, even > if you have no schema: > > <xsl:variable name="comment-elements" > select="//comments//(h1|p|b|i)"/> > > <xsl:template match="*[exists(. intersect $comment-elements)]"> > ... > </xsl:template> > > I think this should work.
Yes, but it might have fairly horrible performance.
I don't know how other processors work, but with Saxon, patterns are a lot more efficient if they identify the element names that match, because Saxon basically does a hash lookup on the node kind and then on the node name. Any match="*" pattern gets tested against every node; and in this case that will involve a serial search through the list of h1|p|b|i elements, which is distinctly O(n^2). Not worth the savings in keystrokes.